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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f00baba57f5eb55c0884a424411cf5e48da64fba0d0a75be3933ace93657b0a9' 
  AND token = '7omm383TT4tq1RF8Ox8EiUAPrPjlBfP9spZW5//oXQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}